Support for [Clamp] and [EnforceRange] to IDL dictionary.

Source/bindings/templates/dictionary_v8.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file has been auto-generated by {{code_generator}}. DO NOT MODIFY!
 
 #include "config.h"
 #include "{{v8_class}}.h"
 
 {% for filename in cpp_includes if filename != '%s.h' % v8_class %}
@@ skipping 10 matching lines @@
         exceptionState.throwTypeError("cannot convert to dictionary.");
         return;
     }
 
     {% if parent_v8_class %}
     {{parent_v8_class}}::toImpl(isolate, v8Value, impl, exceptionState);
     if (exceptionState.hadException())
         return;
 
     {% endif %}
-    // FIXME: Do not use Dictionary and DictionaryHelper
-    // https://crbug.com/321462
-    Dictionary dictionary(v8Value, isolate);
-    // FIXME: Remove this v8::TryCatch once the code is switched from
-    // Dictionary/DictionaryHelper to something that uses ExceptionState.
+    v8::Local<v8::Object> v8Object = v8Value->ToObject(isolate);
     v8::TryCatch block;
     {% for member in members %}
-    {{member.cpp_type}} {{member.name}};
-    if (DictionaryHelper::getWithUndefinedOrNullCheck(dictionary, "{{member.name}}", {{member.name}})) {
+    v8::Local<v8::Value> {{member.name}}Value = v8Object->Get(v8String(isolate, "{{member.name}}"));
+    if (!{{member.name}}Value.IsEmpty() && !isUndefinedOrNull({{member.name}}Value)) {
+        {{member.v8_value_to_local_cpp_value}};
     {% if member.enum_validation_expression %}
         String string = {{member.name}};
         if (!({{member.enum_validation_expression}})) {
             exceptionState.throwTypeError("member {{member.name}} ('" + string + "') is not a valid enum value.");
             return;
         }
     {% elif member.is_object %}
         if (!{{member.name}}.isObject()) {
             exceptionState.throwTypeError("member {{member.name}} is not an object.");
             return;
@@ skipping 29 matching lines @@
     {% if member.v8_default_value %}
     } else {
         dictionary->Set(v8String(isolate, "{{member.name}}"), {{member.v8_default_value}});
     {% endif %}
     }
 
     {% endfor %}
 }
 
 } // namespace blink